Anton Vorontsov wrote:

On Fri, Feb 27, 2009 at 03:25:48PM +0100, Lennert Buytenhek wrote:

quoted

On Fri, Feb 27, 2009 at 06:22:40AM -0700, Gary Thomas wrote:

quoted

quoted

quoted

However, the network subsystem still can't locate it.  It may be
a complication of the OF stuff and how the [gianfar] network
device knows what PHY to look at.

  starting network interfaces...
  24520:01 not found
  eth0: Could not attach to PHY

It's correct that eth0 should not associate with a PHY -- since the
MAC connects to the switch chip over GMII/RGMII/SGMII, there is no
PHY involved.

Yes, but it's expecting to be able to talk to the PHYLIB layer
and ask things like speed, duplex, link state, etc.

quoted

Is the gianfar driver refusing to up the interface without a PHY?
It shouldn't do that -- IMHO it's perfectly fine to not have a PHY
on your ethernet MAC.

It seems so, yes.  I tried disabling the PHY connection in the OF
tree and now eth0 doesn't even try to come up :-(

gianfar authors/maintainers: is there a way of using gianfar purely
as a (R)(G)MII transport, i.e. without it trying to talk to a PHY?
Gary is trying to use it to just pass packets to another
(R)(G)MII-speaking chip that doesn't have a PHY interface, but gianfar
seems to bail out if you don't give it a PHY to talk to.

You can use fixed-link property in the device tree, and CONFIG_FIXED_PHY
driver. See arch/powerpc/boot/dts/mpc8349emitx.dts as an example, and
Documentation/powerpc/dts-bindings/fsl/tsec.txt for the fixed-link's
fields meaning.

Yes, thanks, that seems to work.  I can at least now get eth0
starting to come up - still problems with the actual switch.

Can you give me some guidance on my question (linuxppc-devel list 2009-02-26)
with subject 'OF -> platform_device'?  This is needed in order to
use this switch and the DSA layer.

Thanks

-- 
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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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